Two months after release!
A new breeding mechanic in Pokémon Black and White 2 has been discovered two months after its initial release.
Originally, when the parent Pokémon is capable of having two abilities, the ability that a baby Pokémon received from its mother had a 50% chance of being either ability. In Black and White 2, however, keeping the mother in the first Pokémon slot while carrying the egg offers 80% probability of receiving the ability the mother has, while keeping the parent Pokémon in the second slot while carrying the egg offers an 80% chance of receiving the second ability. This discovery makes it easier on players to grant Pokemon with special abilities.